Outlook - Mac - Change Default Font Change the Default Font in Outlook. Mac 1. Click the Outlook Tab. 2. Click Preferences. 3. Select Fonts. 4. Select the font to change. 5. Choose Font, Font Style, Size, Color and Effects. 6. Click OK. Outlook Font.pdf (300 KB) Have more questions? Submit a request 0 Comments Please sign in to leave a comment.